Stove attachment for grates



Feb. 13, 1923.

' w. S. COBB STOVE ATTACHMENT FORGRATES Filed Sept. 5', 1918 wow,

the fire place showng the stares Patented hl I warren rather s'rovn arreonarnfnr rode: enemas.

Application filed Senteinlier 3 191,8]? Se rial Noh2 52fl25 To all whom it may concern:

Be itlrnown that L VVI-IIT L 5. Gone, a citizen of the United States oi" America, residing at Birminghann in the county of Jefferson and State-of Alabama, have invented certain new a duseful Improvements in Stove Attachments for Grates, of which the following is a specification. V This invention relates to an improvement in a stove attachment for grates adapted to materially reduce the consumption or fuel and to increase the heating el-ficiency of the fuel consumed by "designing the attachment to radiate the heat effectually from the products of combustion betore they enter the chimney flue. v

is a further object of my invention to design the attachment so that it can he inexpensively constructed andreadily attached without requiring skilled labor.

It is a further object of my invention to adapt the attachment to permit ready introduction 0t fuel into the grate and to protect the attachment from undue wear arising from the introduction of fuel.

These andthe other objects o-fmy invention will be more clearly understood by reference to the accon'ipanying drawing which forms a part of this application, and in which 1 Fig. l isa 'lront perspective view of my attachment applied to a fire place.

Fig. 2 is a vertical sectional view through attachment therein in deelevation. i i

Fig. 3 is a top plan view looking down on the attachment as mounted in the grate.

Similar reference numerals refer to similar parts throughout the drawing.

I have shown my invention as applied to the odinary grate l seated in the fire place opening 2 which has a fire brick back-wall 3, an arch frame and a'chimneyline 5,. all such parts being of any customary size or shape.

My invention proper comprises a base portion 6 extending from the hearth to. the

top of the grate and from side to side of the lire place opening. and this base is provided with an ash door 8 having an air supply damper 9 therein. The upper or radiating portion of 'my grate attachment cc sists of a curved flue formed by a front will l0 spaced from a back wall 11 and (UllllEL'lEd thereto by similar side walls 12. The 't'ront wall 10 is disposed on an upward and outward inclination from the top ofthe base'ii'ien her 6 and is then curved on a wide convex arc and passessubstantially horizontauyina the top of the, the place under the top .o-if the arch frame 4 with which it makes a snug fit. This wall 10 continues into the chimney and terminates at a damper l3 .wh'ichf closes the space between the adjacent ends of the front and back walls 10 'andyll and permits the escape of the products of combustion from the heat radiating ilue'; 'llhe'hack'wall 11 is disposed to extend from the rear upper "edge of" the grate with an. upward and. outward inclination to a'point beyond the fireplace and. is then bentlaloout ashort curverand inclined inwardly and upwardly'so to terminate adjacent to the hack wall of the chimney fine at the 'to-poi the ii-re place. As seen in Fig. 3," the top portions of th ewalls 10 and 11, where they projet into the fire place, are inwardly tapered and the side \valls'are sloped inwardly as to conlfactthe discharge opening 1% the-pro'ducts oi combustion 'which is rontrolled by the damper 13. This damper l2, operated by a rod 15 connected atone end to a suitable crank arm 1*? mounted to turn at an exposed position inone ot the side walls 12. Thesexside' walls are pro vided with straigl'it continuous vertical side images '18 extending from thehase 6 to the top oi the arch frame and overlapping the sidesoi: the archfitrame; These flanges are adapted to he made secure to the arch frame by iii-ans of Z-shaped clips 19 which catch behind the inner-faces ofthe sides of the arch frame and. areiconnected to the flanges 18 by holtsor. screws 20. By this arrangement I. avoid the'necessity for drilling the arch frame to mount'the attachment in the fireplace. 2

"1 he front curved wall 10, carriesflin its upperiportion aufuel door 21 which opens outuardly and the lower portion of this wall 10, upon which the fuel would fall, is reini orced by a cast metal wear plate 22. I also preferably interpose a cast metal plate 23 in. the top of the wall 10 between the door and the arch frame and adjacent to the arch frame I provide thisinside plate with a dmvnturned baffle 24:, which tends to restrict the outflow of the products. of combustion towards the opening 14c and reduces the temperature of lhG flODh wall ll) adjacent .to and behind the arch ii 'rameb It is preferable that the hottom portions of the walls 10 and 11, where they project into the fire place above the grate, should be contracted like their top portions and the lower end of the side walls 12 beyond the flanges 18 should therefore be bent inwardly. With such an arrangement it is essential that the grate shouldbe filled at each side the radiating flue, serving to heat the side and front walls equally so that their maximum heating efiiciency is extracted and their flow retarded by the bafiie 2 and damper 13. The rate of consumption of the fuel is controllable by the dampers/1'3 and 9. As the'fuel is consumed additional fuel is introduced. through the door 21 and falls upon the plate 22 and thence is deflected into the grate.

In practice, I have reduced the fuel consumption in grates to half of the normal consumption and obtained a greatly increased amount of heat therefrom.

This invention is not intended to be restricted in scope to the specific embodiments shown, but contemplates such modifications as come within the spirit and scope of the claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is

1. The combination with a normal fireplace having a grate and chimney flue, of a stove attachment comprising spaced inner and outer walls connected by sides to form a detachable. curved radiating flue, means to set said stove attachment in the fire-place with its bottom open end resting on and covering the whole fuel supporting surface of the grate and with its main curved body portion projecting substantially without the fire-place, means to control the admission of air to the grate below the intake end of said flue, a door in said flue for with the lower end of the line covering the grate and with the upper end of the flue entering the chimney, a base plate with a damper therein controlling the admission of air to the grate below said flue, outturned flanges on'said sides adapted to en gage the arch frame about the fire place, and clamp means .to detachably connect said flanges to the frame.

- 3. A gratev attachment having a radiating flue therein formed by inner and outer curved walls having side walls connecting them in spaced relation, said attachment being adapted to fit into and close the fire place opening above the grate and to have the lower inner end of the flue project into the fire place, said lower inner end of the radiating flue being contracted in width, means to control the admission of air below the grate, and means to close in the sides oi the grate to the sides of the said bottom end oi? said radiating flue.

41. In a fire place attachment, means enclosing the the place opening andcomprising a convex flue projecting outside of the fire place opening, a fuel door in the upper portion olf said flue, and means to reinforce the lower inside portion of the flue upon which the fuel will fall before-entering the fire place, substantially as described.

5. In a fire place attachment, means en closing the fire place opening and comprising a convex radiating flue projecting outwardly of the fire place opening, a bottom air inlet damper in said attachment, a fuel door in the upper portion of said flue, and a dmv'uturned battle disposed in the upper portion oi? said flue between the top of the door and the fire place opening, as and for the purposes described.

In testimony whereof I aflix my signature.

Witness:

Nor/rm WELSH. 

